Abstract
1. The NQR185Re,187Re,55Mn, and127I spectra of a number of derivatives of manganese and rhenium cyclopentadienyltricarbonyls were investigated. 2. The change in the quadrupole coupling constant on the metal atom is due to a greater degree to conjugation characteristics of the substituents than to induction characteristics; moreover, in rhenium derivatives this sensitivity is approximately an order of magnitude higher than in manganese derivatives. 3. The higher NQR127I frequencies in (CO)3ReC5H4I than in (CO)3MnC6H4I permit us to consider the (CO3)ReC5H4— group as a stronger electron acceptor than (CO)3MnC5H4-.
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